Hey Alex,
did you manage to get the VLAN-Config working?
I'd love to see this repeaters working, since they are very affordable and the hardware looks quite good. Power consumption seems to be nice as well... and you could probably put 2-3 of them in place instead of a more powerful devices with better antennas.
Here are some references... doesn't look pretty good for the VLAN support... LAN chip (Atheros AR8035) seems to be the same as in Meraki MR33:
Matthias